What's the difference between bassoon and bassoonist?

Bassoon

Definition:

(n.) A wind instrument of the double reed kind, furnished with holes, which are stopped by the fingers, and by keys, as in flutes. It forms the natural bass to the oboe, clarinet, etc.

Example Sentences:

(1) Three instrumental timbres were tested in all contexts: clarinet, trumpet, and bassoon.
(2) The bassoon versions were best discriminated in the single-voice patterns, with equal discrimination in the isolated and multivoice cases.
(3) He's right there, painting the heads of the front row audience and the orchestra beyond, with the madcap performance of the dancers, dressed as nuns, flurrying about on the stage, seen through a forest of bassoons in the woodwind section.
(4) It is suggested that these results were due to pronounced physical differences observed between the spectra of the two versions of the bassoon that were not apparent between the versions of the clarinet or trumpet.

Definition:

Example Sentences:

(1) If it wasn't Randy or Dandy or Rusty or Dusty or Busty or the mad bassoonist who infests Southfork, then it was obviously Rowl who shot JR. Rowl is the Mexican who serves breakfast at those dreadfully windy meals held, so inadvisably, on the patio at Southfork.
(2) While still on treatment with vinblastine-sulfate the decanulement was possible, the patient could resume his profession as bassoonist.
(3) I also enjoyed Jesse Briton's performance in My Fortnum and Mason Hell , a faux-naive narrative about a bassoonist arrested for protesting against Tory cuts.